SPEED REDUCING MECHANISM, DRIVE DEVICE, AND OPTICAL INSTRUMENT

摘要

A vane drive device (1) has a shutter substrate (80) having an opening (81), vanes (40) that adjust the diameter of the opening (81), a drive ring (60) that drives the vanes (40), and a speed reducing member (20) that transmits a driving force from an electromagnetic actuator (70) to the drive ring (60). The drive ring (60) has a driven pin (66). The speed reducing member (20) is supported in a rotatable manner and has a toothed part (24) to which the driving force from the electromagnetic actuator (70) is transmitted, and a cam groove (26) that engages with the driven pin (66). The speed reducing member (20) is formed into a sheet shape that is thinner than the tooth width of the toothed part (24) that rotates under the driving force from the electromagnetic actuator (70).